I don't know what it is about window management apps that I love, but I can't get enough of them. Every time I find a new one I have to give it a try. Divvy is a pretty unique window managment application cause you can choose the section of the screen the window takes up by activating the Divvy menu which looks like a grid. You then simply click and drag, highlighting the region you want the window to occupy. When you let go of the mouse button the window moves to that location.
What makes Divvy even better is the ability to create shortcuts for window positions, allowing you to activate the Divvy pannel and then press your shortcut moving the window to that location instantly. Most window management tools do half screen left and right as well quarter screen in all four corners. Divvy allows you to put windows in different shapes as well as different locations on the screen giving you more control than other application I have tried.
You can download Divvy for free with some nags to get you to buy the full version for $14. I would download it and use it for a while and if you use it long enough the $14 might be worth getting rip of the nags to use it without interruption.